PXI-6682 Datasheet, PDF (3/4 Pages) National Instruments Corporation – GPS, IEEE 1588, and IRIG-B Timing and Synchronization Modules for PXI and PXI Express

GPS, IEEE 1588, and IRIG-B Timing and Synchronization Modules for PXI and PXI Express
Synchronization Accuracy
Table 2 lists the synchronization accuracy that the PXI-6682 and PXI-6682H offer
while operating in various modes.
Mode¹
Synchronization Accuracy
GPS²
±100 ns, <13 ns std deviation
IEEE 1588 3 m Ethernet direct connection³
±47 ns, <10 ns std deviation
IEEE 1588 via hub^3,4
±210 ns, <35 ns std deviation
IEEE 1588 via switch^3,5
±25 µs, <150 ns std deviation
IRIG-B DC
±55 ns, <13 ns std deviation
IRIG-B AM matching^6,7
±1 µs, <220 ns std deviation
IRIG-B AM to source⁷
±5 µs, <500 ns std deviation
PPS
±47 ns, <10 ns std deviation
1_{All synchronization measurements were done by recording the offset between PPS signals generated}
by two PXI-6682 modules inside a closed NI PXI-1031 chassis at ambient room temperature conditions.
Synchronization was performed for 15 minutes before testing began. All test durations were 12 hours.
2_{For the GPS test, two PXI-6682 modules were independently synchronized to GPS and configured to}
generate a PPS signal. The specification above represents empirical results. Please note that GPS
satellites are guaranteed to be within only 100 ns of UTC. Therefore, the offset between any two
synchronized devices can be as high as 200 ns plus the offset of that device to GPS.
3_{Sync interval of 1 second was used for IEEE 1588 tests, and all Ethernet connections were 100 Mb/s.}
4_{Netgear DS104 hub used.}
5_{Airlink101 gigabit over copper switch used. For this test, a moderate amount of non-1588 Ethernet}
traffic was present on the switch.
6_{IRIG-B AM matching specification was obtained by setting two PXI-6682 modules to synchronize}
independently to the same IRIG-B AM source and generate a PPS signal. The offset between their
PPS signals was then measured over a 12-hour period.
7_{IRIG-B performance depends on IRIG-B source stability and quality.}
Table 2. NI PXI-6682 and PXI-6682H Synchronization Accuracy
NI-Sync Software
The included NI-Sync driver software provides powerful yet easy-to-use control
of PXI-6682 and PXI-6682H modules. You can use NI application development
environment (ADE) software such as LabVIEW or LabWindows/CVI, or other
ADEs such as Visual C/C++, for programming the PXI-6682 and PXI-6682H.
For NI-Sync example programs, visit ni.com/examples.
>> For complete specifications and compliance information, see
appendix A in the NI PXI-6682 user manual at ni.com/manuals.
Ordering Information
NI PXI-6682 (GPS, IEEE 1588, IRIG-B).............................................779929-01
NI PXI-6682H (GPS, IEEE 1588, IRIG-B)..........................................781059-01
GPS antenna with 30 m coaxial cable............................................196304-30
SMB 200
SMB plug to SMB plug coax, 50 W, 1 m...............................188859-01
SMB 210
Dual SMB plug to dual SMB plug coax, 50 W, 1 m..............188858-01
BUY NOW
For complete product specifications, pricing, and accessory information,
call 800 813 3693 (U.S.) or go to ni.com/pxi.
High-Stability 10 MHz Timebase
When configured as a star trigger controller, the PXI-6682 can override the
built-in 10 MHz reference clock on a PXI chassis. Most PXI chassis provide a
10 MHz reference clock with 25 ppm accuracy (10 MHz ±250 Hz). This accuracy
is improved to 1 ppm with the PXI-6682. Many modules, such as NI PXI-5xxx
modular instruments, have phase-locked loop (PLL) circuitry to synchronize with
the 10 MHz reference clock.
BUY ONLINE at ni.com or CALL 800 813 3693 (U.S.)
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